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Publication numberUS3948291 A
Publication typeGrant
Application numberUS 05/470,855
Publication dateApr 6, 1976
Filing dateMay 17, 1974
Priority dateJun 6, 1973
Also published asDE2424236A1, DE2424236C2
Publication number05470855, 470855, US 3948291 A, US 3948291A, US-A-3948291, US3948291 A, US3948291A
InventorsHolger Alexis Persson
Original AssigneeAb Bahco Ventilation
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Stiffening device
US 3948291 A
Abstract
A stiffening device for filter hoses of square crosssection includes two substantially identically shaped wires or strips. Each wire or strip is bent along a single plane repeatedly substantially at right angles to each other to form a zig-zag configuration having alternate longitudinally and transversely extending portions. The length of each of the transversely extending portions correspond to the diagnonal measurement of the hose. The two wires or strips are connected with each other at the centre points of the transversely extending portions and at right angles to the individual plane of those portions.
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Claims(3)
I claim:
1. A stiffening device for filter hoses of square cross-section and joined at two diagonally opposed corners thereof with other, similar hoses to form a continuous row of such hoses, said stiffening device comprising two substantially identically shaped wires or strips, each of which is bent along a single plane repeatedly substantially at right angles to form a zig-zag configuration having alternate longitudinally and transversally extending portions, of which portions the latter have a length corresponding to the diagonal measurement of the hose, the two wires or strips being connected with each other at the centre points of the transversally extending portions and at right angles to the individual planes of said portions.
2. A stiffening device according to claim 1, characterized in that each wire is provided at each end thereof with a rectangular loop-shaped portion.
3. A stiffening device according to claim 2, wherein said loop-shaped portions comprise the end portions of respective wires which are bent rearwardly to extend parallel with said longitudinally extending portions of said respective wires at points along the lengths thereof.
Description

The present invention relates to stiffening devices for tubular, non-self supporting objects, and in particular for filter hoses of square cross section which are joined at two diagonally opposed corners to similar hoses, to form a continuous row of such hoses.

The stiffening device of the present invention can be readilly produced in a relatively inexpensive manner and is solely comprised of two identical elements which, when the device is in place in a hose of the aforementioned type, will reliably stiffen the hose along the whole of its length. With the device of the present invention, the hose is supported along the major portion of its length solely by stay wires located in two adjacent corners of the hose while the two remaining corners are free. This is an advantage when the hose is being blown clean (shape changing).

The stiffening device of the present invention is mainly characterized in that it comprises two identically shaped wires or strips which along a single plane are bent regularly substantially at right angles to each other to form a zig-zag configuration having alternate longitudinally extending and transversally extending portions, of which portions the transverse portions have a length corresponding to the diagonal measurement of the hose, wherein the two wires are connected together at the centre points of the transversally extending portions and at right angles to the individual planes of said wires.

In order to avoid sharp end portions and to increase the rigidity of the stiffening device, it is convenient to give each end of the wires a rectangular loop-shaped configuration, by bending the end of the wire back along itself and joining said end to said wire, as illustrated in the drawing.

The transversally extending portions of the two wires may be joined together as by welding, preferably as by spot welding, although rivits or nuts and bolts may be used, it being possible in this latter instance to vary the angle between the two wires and to turn the wires so that they lay flat against each other, thereby facilitating storage of the same.

The wires are preferably made of a suitable metal or metal alloy, although other materials such as plastics or glass may be used.

So that the invention will be readily understood and other features thereof made apparent, a stiffening device according to the invention will now be described with reference to the single drawing forming part of this specification.

In the drawing the two wires are identified by the reference numerals 1 and 2, while references 3 and 4 identify the longitudinal extending portion of the wires, and 5 and 6 the transversally extending portion of said wires. The points at which the wires are joined together are shown at 7 and the rearwardly bent end portions of the wires are shown with references 8 and 9. As will be understood from the drawing, the hose-like object to be stiffened by the stiffening member will be given a square cross sectional shape at the portions thereof where the transversally extending portions 5 and 6 intersect each other at right angles, the diagonals of the hose of square cross section having the same length as the transversally extending wires portions of the stiffening member. When the transversally extending portions intersect each other at an oblique angle other than 90 a rhombic cross-sectional shape will, of course, be obtained.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US147446 *Jun 28, 1873Feb 10, 1874 Improvement in steam-boiler flues
US1471207 *May 8, 1922Oct 16, 1923Riddle Napoleon BSanitary individual saliva ejector
US2327347 *Aug 29, 1940Aug 24, 1943Leslie A GibbinSaliya ejector
US3402741 *Jun 21, 1965Sep 24, 1968Alfred YurdinSelf-supporting, bendable, shape retaining discharge conduit
US3889717 *Dec 14, 1973Jun 17, 1975Deere & CoReinforced flexible tube
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4420016 *Jan 7, 1982Dec 13, 1983Nichols Ralph AKink-preventing spine for aquarium air hoses
US5730554 *Mar 22, 1996Mar 24, 1998Abb Vetco Gray Inc.Apparatus for operations on a subsea well
US5741014 *Sep 14, 1995Apr 21, 1998N.V. Raychem S.A.Duct sealing
US6604549 *Sep 25, 2002Aug 12, 2003AlcatelDevice for fixing a tubular element in an inaccessible cavity
US6706085 *Mar 22, 2002Mar 16, 2004Albany International Corp.Filter bag cage
Classifications
U.S. Classification138/103, 55/379, 52/856, 138/178, 138/108, 248/75
International ClassificationB01D46/06, B01D29/13
Cooperative ClassificationB01D29/13
European ClassificationB01D29/13